it depends on what for you plan to use it
also id it VMware? physical? SAN based storage?
How many array controllers? etc..
check
SQL Server Storage Best Practices
http://sqlmag.com/storage/sql-server-storage-best-practices

You can use it but turn off any READ caching, SQL server is a in memory db engine and will use RAM as much as possible. Using cache memory for reads is a waste for SQL Server. If you need to read from your disk cache for SQL, there's something wrong.

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